Mail 6.6 question

I'm still running male 6.6 and I had a question for you. In a previous version before this was updated there was a way to check a box that would take your mail off the server once read. Is that functionality anywhere easy to find in this version of male 6.6? Can't find it. Also is there a way to make it a specific length of time it gets removed from the server maybe from 1, 2, days, maybe a week or two weeks?